This section will explore some of the common issues related to the DHCP service and which tools OPNsense has to help us solve them.

Let's start by checking the online hosts on the DHCP Leases page. On this page, we can check the leases attributed by the DHCP server. To access the DHCPv4 leases page, go to Services | DHCPv4 | Leases, as illustrated in the following screenshot:

Figure 11.3 – DHCPv4 leases page

As the preceding screenshot shows, on the DHCP Leases page, we can check each lease with the following information: Interface, MAC address, Hostname, Description (if it is added in the static mapping), the Start and End time of the lease, Status, and Lease type. If you need to check expired leases, click on the Show all configured leases button at the bottom of the page. There is also a way to add a static mapping on this page. To do so, click on the + button that is placed at the end of each dynamic lease line.

The Leases...